#include"f.h"

class Preson
{
public:
	size_t _year;
	string _name;
};

class Student:virtual public Preson
{
protected:
	int _id;
};

class Staff :virtual public Preson
{
protected:
	int _number;
};

class My:public Student,public Staff
{
protected:
	string _address;
};

int main()
{
	My a;
	a.Staff::_name="sa";
	a.Student::_name = "aa";
	return 0;
}